1. Combine first 5 ingredients in a blender or food processor. Blend or process til smooth.
2. Pour into a non-reactive saucepan and add stock, sugar and pepper to taste.
3. The heat in this recipe all depends on how strong or mild your chili peppers are. If they are too hot add a bit of sugar. If they aren't hot enough add a jalepeno pepper or habenero pepper.
4. Bring to boil over high heat, stirring often. Reduce heat to low, cover and simmer for about 10 minutes.
5. Poor over enchiladas. You can make this ahead and cool and refrigerate or freeze for later use.